.\"	$OpenBSD: utrace.2,v 1.1 2013/06/01 09:49:53 miod Exp $
.\"	$NetBSD: utrace.2,v 1.13 2008/05/02 18:38:32 martin Exp $
.\"
.\" Copyright (c) 2000 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Gregory McGarry <g.mcgarry@ieee.org>.
.\"
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.\" modification, are permitted provided that the following conditions
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\"
.Dd $Mdocdate: June 1 2013 $
.Dt UTRACE 2
.Os
.Sh NAME
.Nm utrace
.Nd insert user record in ktrace log
.Sh SYNOPSIS
.In sys/types.h
.In sys/param.h
.In sys/uio.h
.In sys/ktrace.h
.Ft int
.Fn utrace "const char *label" "void *addr" "size_t len"
.Sh DESCRIPTION
Adds a record to the process trace with information supplied by the user.
The record is identified by
.Fa label
and contains
.Fa len
bytes from memory pointed to by
.Fa addr .
This call only has an effect if the calling process is being traced.
.Sh RETURN VALUES
.Rv -std
.Sh ERRORS
.Bl -tag -width Er
.It Bq Er ENOSYS
The currently running kernel was compiled without
.Xr ktrace 2
support (option KTRACE).
.It Bq Er ENAMETOOLONG
The length of the
.Fa label
string was longer than
.Dv KTR_USER_MAXIDLEN\-1 .
.It Bq Er EINVAL
The specified data length
.Fa len
was bigger than
.Dv KTR_USER_MAXLEN .
.El
.Sh SEE ALSO
.Xr kdump 1 ,
.Xr ktrace 1 ,
.Xr ktrace 2 ,
.Xr options 4
.Sh HISTORY
The
.Fn utrace
system call first appeared in
.Fx 2.2 .
It was added to
.Ox
in
.Ox 5.4 .
The
.Fa label
argument is an extension.
